Phase-lacking detection protector for hoisting electric machine of groove-controlled machine

The utility model relates to an electric technology, in particular to a cell controlling machine lifting motor lack-phase detection protector of an electrobath intelligent vague controller single-chip microcomputer electrical automatic controlling system which belongs to the aluminium electrolysis industry. Opto-couplers N1, N2 and N3 of the cell controlling machine lifting motor lack-phase detection protector of the utility model are respectively connected between different phases of a three-phase AC power supply; the primary sides of the opto-couplers N1, N2 and N3 are parallelly connected with LEDs D1, D2 and D3; the secondary sides of the opto-couplers N1, N2 and N3 output signal and send the signal to the control system; when any phase of the cell controlling machine is not communicated when the anode is lifted, the control system program receives the contact lacking closed signal, the lifting is abnormal and the rotation of the anode is cut off. The protector has the advantages that the protector effect